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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd2a8158adddbfdad5194f591481415590e90ded2beff388720c49cba7b3231f' 
  AND token = 'bolpy18fNwEj98e8kMENspxTqR9Tri1dJ6TmBadaEa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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