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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a0233eec4f8c27f72703271f384a59cedf94eb03a541815276c6bf69742a00d' 
  AND token = 'QOZuuJhZAFgFF3M0GEgJ8co0XLYefaz7h7/b9WLVVX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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