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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee2819f4c15135c7478d36a821feba8ec0f4bfae04cd932c9e5c0a21e498bae' 
  AND token = 'EJdi4da6AEwRVt+DfGspUT6LdH4jchgyhO4RSXn4q54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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