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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80c014a55e6b511933ee71a952fbea8e6c12fc0b4a64df4c6f1cc96e1ccc92d5' 
  AND token = 'yi6nJSE4W8tEfGLi/O3FCz8/Yse9ogxDbwTdV7L07iM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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