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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cdabb0db3eb430b2c9fc0c2a65be62d64b637d1faf6a82c26d04942ca0e2690' 
  AND token = 't0g1Ga6fRe71GNDnl9TZJGlawdQIJmMPhEFoM8ejlDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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