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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524b1376f980fb7e712f5cec1151d6fb839f81234d024c8ce213b3d79a4c6f8f' 
  AND token = 'wZFMXi5YJF2W1MYtnVglWDT50mBgz1OlXVSMnO1bdjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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