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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71fe9b858647882bf2ac39e671274e81c4fe38d1e82dab4cbe0ea936eb24ccec' 
  AND token = 'd/OGjXQogj/MytM8aAshdr464D9+KeMKY+pdVhRPxA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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