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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5352b070d7125a34e82b2ad5eff72d8b9b768a3f509dbc03b6e15b85b73ce1b7' 
  AND token = 'PBUJ2kWxM+JIJrGe2r2Xy9ygVm8zg1TBKaWv9uRbAnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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