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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e825df8f004065342c6b9cfd3b74376eb47db3fd393309f51c4f4b7e9d85d20' 
  AND token = 'tcbGVozOUmufmrjnGNMV5V8RomxNLT3PVUtme2/+DJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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