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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7bfd5e10d0cffee640b27fd32771ff3a7bcddc8bcb8984ea820e4fa91233faa' 
  AND token = 'FOCey/y1hr0ytnrUuwo+tofxhG6i/Dxin74BBV+ev8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}