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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88dbf82a8fdf57fb458bf9c2ec1d331d0bf6fe0eac0a274f829f9e96918f81b2' 
  AND token = 'mNwHffkflwn59sbyz2SdnzsIdxLoiRGw2FD7oHE10Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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