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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbf4d7ac49f0544b956d9096b14dfb5f12fb0eb75ab8f0017735c3a07588bda4' 
  AND token = 'SEWwtKKH2QAu2dDpQ3Exdg9a3y0IRtnVHZOr+S/XH+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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