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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb911fee52ce7b74aa6964755d9c394e557ca2639a3a5a8ff0a3fa3d2c658801' 
  AND token = 'BFIoW25AQ9O/0Xff/WMRmdiwwKrq6/mS9M1Fwj5FwGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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