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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca1bdd76c6d92fea4b27e80ca1c27bfe69f562c4ae350121fa6e1f301353e141' 
  AND token = 'mzIX7d8Y3RAEoWGC82tWgBp5J9SwIdeMqsic2Y2POmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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