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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9841c23d7bfd8e4fcebd618b466fbd4dde99d6d0abfdb10de9a45a6023cf4cd' 
  AND token = 'iBsZ0FOWj/Sotngn4K9reAH5M/L0qLOSGRlOMCcs65Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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