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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e6e0b136a8d2c464676b7249b84c0b6a7564e9be9c40ca0eef4f970689f69db' 
  AND token = 'uD6b6yuiSlP75dcPD3dwdInYz4YE40vz2jejouMaHwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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