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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2948b24a4ecc7938c9a26407ccb30a52604e33a4b660a0d4023a800c6c73d0f2' 
  AND token = '2folRX6tfRHd5Pg60SzxeFYToNuOnF1sJm1evAcz1DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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