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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba5d7c479599a296d4016ce96ca6db15c91f42b49806f5093c5d373e0ee1e77' 
  AND token = 'Op8FYYWc+6HigJGa4sOgGf0VB+uZeQ++38S59yS7Wt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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