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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0a240ddea74ba7ee327faeb74effd8643cc7907f240285387f7ccb625266bd3' 
  AND token = '9dTfMVepzHZF3qCn1KTwJMjWH0b3KpmHcJqaO6qfgks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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