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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd48963412b9e70261f932ba3e462571b228fc4a401ef5b9ac8f4a6b46d1d5ac3' 
  AND token = 'ufA8h5aMQsXib1+Whj5FmUhlyUEXxmUHpf3IjW5EuKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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