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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '226c13ef0d549faa51939771552b8194310ae582e77d7cd39dea5dd42e54648c' 
  AND token = 'njs4ZjBIvFB7kLAvNLzCWC9/TxgDjNS5a/0p4Z4/JM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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