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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '675a17130a1f2e2329e38199513ba3cc5d776841511d34df6a17b78c738584e2' 
  AND token = 'GHROMHbk7GdeesN1Pk0Q+mt59aDzXkMARa+DS8t/X3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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