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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c3042aa976b944b21a947a1d4ad44264f9bc6a8ef90dc5475ce94503ae598d6' 
  AND token = 'znVC6iznFfHUY5i3LF+DTMjEy0xYctiCr/WaSKdCGq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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