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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea718c245163a135b80986e24faeff4b8a1dc79b305803ae30e44434a1ca4ba' 
  AND token = 'fkn0+JqD38zxJfVzBbCwEFJ1tTP7M+tiORqAXUaRtZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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