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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad34277cb4979575b48d9cf040046c50a9dfc5bcd9ffe25d26f11ea7f1b17d6e' 
  AND token = 'rKkWyDmj1iEzBm8oNzocbWh03ZGMwmuoePGHpoo+ses=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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