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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '330ac5cce8f9c5829f50453f86980bc33036b6604a3c814c89104666a5f5bf14' 
  AND token = 'e1HoQwmNYtKNZRr2cRlzu2w8fNHmIOSWOlRWHJ4NhwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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