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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2dcdd00e6d605ed299ce8f8b7717c249932638649dd7f4d1d4b9c50243dd560' 
  AND token = 'Bj1/0X3awdWtiJa+hTLk2ayBesX3gBW5ntoO09ke+Jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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