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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2293d96c871aecc4221814e0203ebcd7d038d12ffd83049341994645ea73fa21' 
  AND token = 'myJBW7BO7Rf2CRbxgTjiWngAknAiKXaUZ401UeZa0/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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