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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d56406131a7e48f9591d871cb7dc29c5977e0b79ee7797fec16b15f3c90ad2' 
  AND token = '1O8BrYgGg/81NlDqlkn/3pCFolMbvuAt8m3SdIPqqC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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