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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f2ae750d6e8cf3e17b5f1b45276e9d57cbac63bd2866acbc44772d7c256ff9' 
  AND token = 'db6hAwRXyR5ap26uq3nuzBGzXfoph8ECO0IPyAAWQNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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