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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2be0f1c53f7cf05d3ddbbd736f26955eaa2b2f4552fd16c8a70ca45076219cf7' 
  AND token = 'RosKgAr643Su/gTg4KSUD8fkrfICXyb9SxiiqcxRzek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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