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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f27dd96969dc768ea7e7d00dc8f49c74c4a85a32867de14e660db820c17a8b1b' 
  AND token = '2vzVc5om/S6znpkmo5oXbPUpI/ZoJP4lilKlCn5bh+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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