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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e05e1d971a33b179272f877886d9ca8dcea6aacf0aa6d1dce6714ed51e9630' 
  AND token = 'nGHcmWXftnLbqzdx2Iy8QxaPbihJk3J79RrcbVIDYgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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