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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff63e54a37a3326b39d05da5d2e5060ad59b488d9259667d62920b59dc6cd48b' 
  AND token = 'bKODiSvdoiE3gCtOIxlGTX8z8e8Dgt7LL0d9UXGAvyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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