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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32af35c467bcfd1b5c0d8ade962ef5e6f0faefbe988da2ad1ad7625e19e1dedb' 
  AND token = 'hsF5b8Y4MaEItSA3RIjo4V/8qh/w+ijakXVRtryunDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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