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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cd3a2da65fd2fc7d88cad758fe81fa78a70ee049452ed519032e895b89d49c2' 
  AND token = 'Pp2dkk1Ya337XIa9+Fq7eqWx5vAGG8KbJ94CHElhQnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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