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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b9eed58fc4ce4e227ecaef3b98fd5f2f02055767fd3b3cfe52f72ced6eb2a2' 
  AND token = 's2d0bvtNbWHM7MCrOaLUeHTaUaeTIWvVbJmQLy07cYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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