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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a1fe15b6ddf9b9d55c484dc2e4496b15cb26688182a342c3aca4dc0a96568aa' 
  AND token = 'PlXwMEfHiaDOH5YJ3DqlTiAeP1B7dVyLWe20FMB0Xmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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