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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff250e1ddcc952ab31fa66dd72cc0f1d7f622b0d41c2eef47e80bc1ce7aea4fb' 
  AND token = '2+R5bm8Sp8xeJt9PKiPYryy4/IDjM9AdM+cWerw3foo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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