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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '077dad75fa3e2c3d02b1a7dc8ecba976cc135960291d9f637bf6eacad002ce9b' 
  AND token = '3sI7RT8eMkkvrPX0aUknyM3AcYzlHfIiMNvsTPOrlcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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