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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '517c3c3d44957d70a89f2e2f5743b2d4a4b7f4107691a701622f39f4758bd6ff' 
  AND token = 'rutbdYYOimFlxw2AEf/OAaWgxLMV58SSMgbicnuNevA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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