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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c66eea9fef43a57eaf4f34c75abe8e1f698d6f65fd67455da37ef8f322301c58' 
  AND token = 'vYDeUU7q7uTBSXJYIIB7XGwIdM/oKusaxT3Usgd5vSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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