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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b38e01cd57c79e531b961e7a1dc05befde9cd5931b0eee6b7e1102ecd4ce3892' 
  AND token = 'wzqHhYRFSk14mxNwMvDBBnq1IXKXcmcsL+TMxH6yBdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00194

JSON explain

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