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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4afd530b3c51add7a98ce1dbf15a9f59d160fa8610f17c882e626f03444ed27' 
  AND token = '+S3w2mpmN40s0HUK1xgLmQpfIbz9o/2JhfJtT75iU/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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