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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1506d80cb231e6e42d1bae6cb50e4c2c0a8fd10a1cd658d388ad1b18da5ff4fc' 
  AND token = 'k9j+SvQJrHtqMdVOlEG22/i7HtFYNdpvs78g0OuLce0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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