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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21fe9dbc8e1ff1212414d9018e484f57e1aa1f42363f793b92e9dda9800c6b3e' 
  AND token = 'Cq8TrIE7AYXz8Iv5SuU1FvtoKcOg0cEwbOOFd5Yv9KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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