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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4198655f3ed3d14e33e2199d381592a5e3b9390ce5e9e205fb6110dbb791e736' 
  AND token = 'Nfw94HuyKzgqZ1vaBFk09Hj97co8T+1tmXVwDGzw/sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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