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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9829a6eb5aa26c2682c2a7e5d1dc79a85c5f62c895d0adbfa8f485e258f16f82' 
  AND token = 'aOgfksl6KrQVjj2+o0DGEhwg6Ck4/eVE7+i1zngdNzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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