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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '432ca9c0ad45f30bc5f61192eea9eb2fe12429a20c56568b9a573e2b6fa58bfd' 
  AND token = 'f34PLEz1BmFX5CR2HTUOypaHZ0+IIfEGBfjfdlPJJnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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