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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b97b623abf720d8aea1bccfb9ff35f61a2c45c10e5c8a607ec3b7e5a0ccea4e' 
  AND token = 'UzxkeyCo39VWKH8ubQ67AmQAALDjl7yR04invUG1q3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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