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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e065358e477e0604a000cb674b0e8b00edc807d79e0e151d108af022da398f' 
  AND token = 'f9Vgf9DgFCKsYhs1NOZNkg32UZLVyZAPw9hpGlaZavk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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