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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcd03dc29c032bb15ee4e21f74126fc5565a4a1829a237f607cb6f63ee59c0f1' 
  AND token = 'Als20x4imEqpcED63RCTy5ISMul1bEkcffiEf+99O0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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