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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c13a59ab43a127278162dc58676d9359251fd558dc6602ec7251255023d831e' 
  AND token = 'MkVbjvJZAG4pZNh61RGbuHuDp4VRWMxRiqkBnko+SEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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