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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c827ef4c5a878a8e38605549fb11ac2108eb93580dc2282ece402d8afbb4b44b' 
  AND token = '+zkL1ZtOC4/JO494YZ7yvSItl5Ueq2TATLxjmtpGtmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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