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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60d1fd296676a74bb43b0e12740c5d8722536b762ef692448a0312b280c42e04' 
  AND token = 'pAoAus6nbRrOj91mLO5wZQXcp6kjeZO0TCx3U8dXCD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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