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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e369af3dc29cedbdf67b93280f36b370e4a26a4eeabfaf75009316ece1e4e49' 
  AND token = '/OZinCAogOHJkHL2Q1w8iPOjbxbzdHdKqknzOMCflSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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