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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '310b09e1bafa62a106e3e8aca82e223f290e2f076d1f5a10921159a14265562f' 
  AND token = 'ojVKu+YA0gcElpGpzkkBuPI3tRLj5eAR4ByXLS63ZgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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