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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f6aa80fddb4d5053aef466a4964e9b08c647948599b5e5cf276ee80c76ab6a9' 
  AND token = 'ylZyeVQvo9h+GhoJimmjtDwXnISTVyjkyqoTRaQ26rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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