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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c35df177f8606531eb7ac4a5681406dd9279166cdfecb76380e6f2ec7fdbc6' 
  AND token = 'NGS2ItgIWMhrF4wzSGl8GmLMLuJKtUvND3tm83G+WKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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